BMR- Fireman Ch.3, 4, & 5

Question 1

Atmospheric pressure is what psia at sea level?

Answer 1

14.7

Question 2

A peculiar thing happens to water and steam at an absolute pressure of 3206.2 psia and the corresponding saturation temperature at 705.40°F. At this point, called what, the vapor and liquid are indistinguishable?

Answer 2

Critical point

Question 3

Boilers designed to operate at pressures and temperatures above the critical point are what boilers?

Answer 3

Supercritical boilers

Question 4

As the steam leaves or exhaust from the LP turbine, it enters what system?

Answer 4

Condensate

Question 5

What is the dividing line between condensate and feed water?

Answer 5

DFT

Question 6

What is positioned on the boiler to perform one basic function, which is to act as a preheater?

Answer 6

Economizer

Question 7

What systems supply steam at the pressures and temperatures required cooperate many systems and machinery, both inside and outside engineering spaces?

Answer 7

Auxiliary steam

Question 8

The function of what in the steam cycle is to convert water into steam?

Answer 8

Boiler

Question 9

What is a compartment contains boilers and the operating station for firing the boiler?

Answer 9

Fire room

Question 10

What is a compartment containing boilers but not containing the station for firing or operating the boiler?

Answer 10

Boiler room

Question 11

What is a compartment containing boilers and the station for firing or operating the boilers and main propulsion engines?

Answer 11

Main machinery room

Question 12

What is the time during which the boilers have fires lighted until fires are secured?

Answer 12

Steaming hours

Question 13

Boiler overload capacity is usually what percent of boiler full-power capacity, for either steaming rate or firing rate, as specified for the individual installation?

Answer 13

120%

Question 14

What is the actual temperature at the superheater outlet?

Answer 14

Operating temperature

Question 15

Naval boilers are divided into two classes, propulsion and what?

Answer 15

Auxiliary

Question 16

In what boilers do the gases of combustion flow through the tubes and thereby heat the water that surrounds the tubes?

Answer 16

Fire-tube boilers

Question 17

All propulsion boilers used in naval ships are of what type?

Answer 17

Water-tube

Question 18

In what boilers does the water flows through the tubes and is heated by the gases of combustion that fill the furnace and heat the outside metal surfaces of the tubes?

Answer 18

Water-tube boilers

Question 19

What term is commonly used in engineering to describe any tube , chamber, drum, or similar piece to which tubes or pipes are connected in such a way as to permit the flow of fluid from one tube ( or group of tubes ) to another?

Answer 19

Header

Question 20

Most boilers in use in naval propulsion plants operate with a slight air pressure (seldom over what psig) in the boiler furnace?

Answer 20

5

Question 21

On almost all boilers used in the propulsion plants of naval ships, the superheater tubes are protected from radiant heat by what?

Answer 21

Water screen tubes

Question 22

Header-type boilers and some older drum-type boilers are often called 400-PSI BOILERS even though their operating pressures range from about 435 psi to what psi?

Answer 22

700

Question 23

What provides a space for the saturated steam generated in the tubes and for the separation of moisture from the steam?

Answer 23

Steam drum

Question 24

What equalizes the distribution of water to the generating tubes?

Answer 24

Water drum

Question 25

The tubes that lead from the water drum to the steam drum are called what?

Answer 25

Generating tubes

Question 26

Components of the steam drum area are known as what?

Answer 26

Internal fittings

Question 27

What is the large, room-like space where air and fuel are mixed for the combustion (fire) that heats the water in the drums, tubes, and headers?

Answer 27

Furnace

Question 28

Air is forced into the furnace by what?

Answer 28

Forced draft blower

Question 29

What, which are devices for producing a fine spray, breakup the fuel oil into very few be particles?

Answer 29

Atomizers

Question 30

The steam-assist atomizer employs what psi of steam mixed with the fuel oil to help atomize the fuel oil?

Answer 30

150

Question 31

What atomizer is unique in that it is the only atomizer in use in the Navy that has moving parts?

Answer 31

Vented-plunger

Question 32

What is a small boiler that supplies steam for distilling plants, space heating, oil heating, water heating, galley, and laundry?

Answer 32

Auxiliary boiler

Question 33

Two methods are used in turbine design and construction to get the desired results from a turbine. These are the impulse principle and what other principle?

Answer 33

Reaction

Question 34

What term means that the force that turns the turbine comes from the impact of the steam on the blades?

Answer 34

Impulse

Question 35

Turbine casings are made of what for non superheated steam applications?

Answer 35

Cast carbon steel

Question 36

For turbine casings used in submarines, a percentage of what material is used, which is more resistant to steam erosion than carbon steel?

Answer 36

Chrome stainless steel

Question 37

The primary function of the nozzles is to convert the thermal energy of steam into what energy?

Answer 37

Kinetic

Question 38

The primary purpose of what is to carry the moving blades that convert the steam's kinetic energy to rotating mechanical energy?

Answer 38

Turbine rotor

Question 39

The rotor of every turbine must be positioned radially and axially by what?

Answer 39

Bearings

Question 40

What carry and support the weight of the rotor and maintain the correct radial clearance between the rotor and casing?

Answer 40

Radial bearings

Question 41

What prevent the leaking of the steam out of or air into the turbine casing where the turbine rotor shaft extends through the turbine casing?

Answer 41

Shaft packing glands

Question 42

What packing consists of rows of metallic strips or fins?

Answer 42

Labyrinth

Question 43

What restricts the passage of steam along the shaft in much the same manner as labyrinth packing strips?

Answer 43

Carbon packing rings

Question 44

The four areas of operation in a main steam system are generation, expansion, condensation, and what?

Answer 44

Feed